Dry battery.



F. P. BAUMAN.

DRY BATTERY.

APPLICATION FILED FEB. IB. |916.

Patented May 28,1918.

FERDDTAND PAUL BAUMAN, 0F XSIAHACHT, SWITZERLAND.

DRY BATTERY.

Specification of Letters Patent.

Patented May 28, 1918.

Application tiled February Il, 1916. Serial No. 79,198.

To all whom zt may concern.'

Be it known that I, FERDINAND PAUL BAU- MAN, a citizen of the Swiss Confederation, residing at Ksnacht, Canton Zurich, Switzerland, have invented new and useful Improvements in Dry Batteries, 0f which the following is a specification.

The invention Vrelates to an improved dry battery of the kind which is provided with plate electrodes and carbon electrodes impregnated with impervious substances and havlng a cavity at one side for the reception of a soft electrolyte which is in contact with the negative electrode which latter is always disposed adjacent the positive electrode of the next element or couple of the battery.

The novel feature of my invention resides in that the carbon electrodes are impregnated to a suitable depth 'at the face rearward of the cavity onl that the impregnating substance provides only at the surface of the electrode a complete filling la er for the pores; and that the said carbon e ectrodes each carry at the impregnated surface a metal frame which faces an rests against the negative electrode.

Reference is now had to the accompanying drawing, in which:

Figure 1 is a fractional front elevation, and

ig. 2, a vertical section of one form of my improved dry battery.

In this form of battery, shown by way of an example, it is resumed that theele-` ments in respect ofp materials are built on the Leclanch system. The batter is com-` posed of three cou les of plate-e ectrodes. The positive electro e a, consisting of a mixture of, manganese dioxid and graphite has on one side the cavity b surrounded hy a border c to which is a plied an insulating layer d. In the cavit of each element is lilled a pasty electrolyyte e containing ammonia-solution that is to say ammonium h droxid, said electro] te being flush with t e surface of the insu ating layer d. On the opposite side to that having the cavity b, the electrodes a are impre ated to a suitable depth in the pores w1 h a illin Substance or mass f such as paraffin. T e .impregnation prevents the dam drawn by the electrolyte e into the 'electro e a, from passing through to the opposite side. Over each of the impregnated sides' of the electrode is applied a thin covering g of ood conducting material such for examp e as co per.

, The application of the coverin is a vantageously carried out in the ga vanic manner by deposition, conducting material, for example copper, applied so as to establish intimate contact between the carbon electrode of the one element and the zinc of the adjacent element. Each element comprises, adjacently to the electrolyte e and insulating layer d, a negative zinc-electrode h. The three elements forming the battery are placed close together with the opposite poles of the electrodes. The coverings g rest against the zinc plates It and insure a good permanent contact between the several elements.

For kee ingthe battery securely together a non-conducting sheath z' is provided which may be of parain for example. The iinished battery forms a compact body and can be easily introduced in any electric circuit.

The improved battery has, in comparison with the usually known batteries, the advantage of being easily and cheaply manufactured. The same is especially advantageous for pocket lamps, these being hitherto furnished with batteries of more or less diliicult construction requiring great care and accuracy in tting and imposing an elevated price for the lamp.

A dry battery of the kind having plate electrodes of which the carbon electrodes are impregnated with impervious substances an formed with a cavity at one side for the reception of soft electrolyte which is in con- -tact with the negative electrode each of which latter is in contact with the positive of the adjacent element, fitted with carbon electrodes impregnated to a suitable depth at the face rearward of the cavity4 only where the impregnating substance is made to form only a complete surface fillin layer for the pores, and a metal frame a p ied to the impregnated face of each car on electrode to serve as solid contactportion with the adjacent negative electrode.

FERDINAND PAUL BAUMAN. Witnesses:

CONRAD BoLBsHAUsnR,

CARL Geenen...

to form a coating of good 

